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Proceedings Paper

X-Spec: a multi-object trans-millimeter-wave spectrometer for CCAT
Author(s): C. M. Bradford; S. Hailey-Dunsheath; E. Shirokoff; M. Hollister; C. M. McKenney; H. G. LeDuc; T. Reck; S. C. Chapman; A. Tikhomirov; T. Nikola; J. Zmuidzinas
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Paper Abstract

We present the result of a design study for X-Spec, a multi-beam, R=400{700 survey spectrometer covering 190{520 GHz under development for CCAT. It is designed to measure the bright atomic fine-structure and molecular rotational transitions that cool galaxies' interstellar gas, in particular, the 158 um rest-frame [CII] transition, in thousands to tens of thousands of galaxies ranging from z=9 to z=3.5. With the wide bandwidth and multi-object capability, X-Spec / CCAT will be more powerful than ALMA for redshift-blind galaxy surveys and tomographic intensity mapping. X-Spec uses SuperSpec filterbank spectrometer technology with TiN KIDs described by Hailey-Dunsheath et al. in this conference. Because the density of sources is small, galaxy follow-up will be most efficient with a front-end steering unit which we have prototyped, also described in a separate paper (Chapman et al. in this conference). Our baseline instrument concept has 84 steered beams arrayed over the 1 degree CCAT field, each beam couples to 4 chips (2 bands x 2 polarizations) each chip with approximately 500 detectors, making a total of -170,000 KIDs in the full instrument. A direct imaging spectrometer (integral-field spectrometer) with a comparably-sized backend is also considered.

Paper Details

Date Published: 19 August 2014
PDF: 12 pages
Proc. SPIE 9153, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII, 91531Y (19 August 2014); doi: 10.1117/12.2056750
Show Author Affiliations
C. M. Bradford, Jet Propulsion Lab. (United States)
S. Hailey-Dunsheath, California Institute of Technology (United States)
E. Shirokoff, California Institute of Technology (United States)
Kavli Institute for Cosmological Physics, The Univ. of Chicago (United States)
M. Hollister, California Institute of Technology (United States)
C. M. McKenney, California Institute of Technology (United States)
H. G. LeDuc, Jet Propulsion Lab. (United States)
T. Reck, Jet Propulsion Lab. (United States)
S. C. Chapman, Dalhousie Univ. (Canada)
A. Tikhomirov, Dalhousie Univ. (Canada)
T. Nikola, Cornell Univ. (United States)
J. Zmuidzinas, California Institute of Technology (United States)


Published in SPIE Proceedings Vol. 9153:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII
Wayne S. Holland; Jonas Zmuidzinas, Editor(s)

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